Tolong bantu jawab no 3 please..... Aku kurang ngerti maksudnya Makasih sebelumnya

3/5 = 6/10 = 27/45 = 30/50
4/9 = 8/18 = 20/45 = 24/54
5/8 = 15/24 = 30/48 = 45/72
6/7 = 24/28 = 42/49 = 78/91

semoga membantu:) (maaf jikalau salah)